1 #include <linux/errno.h>
2 #include <linux/signal.h>
3 #include <linux/sched.h>
4 #include <linux/ioport.h>
5 #include <linux/interrupt.h>
6 #include <linux/slab.h>
7 #include <linux/random.h>
8 #include <linux/init.h>
9 #include <linux/kernel_stat.h>
10 #include <linux/sysdev.h>
11 #include <linux/bitops.h>
13 #include <linux/delay.h>
15 #include <asm/atomic.h>
16 #include <asm/system.h>
17 #include <asm/timer.h>
18 #include <asm/pgtable.h>
21 #include <asm/setup.h>
22 #include <asm/i8259.h>
23 #include <asm/traps.h>
27 * Note that on a 486, we don't want to do a SIGFPE on an irq13
28 * as the irq is unreliable, and exception 16 works correctly
29 * (ie as explained in the intel literature). On a 386, you
30 * can't use exception 16 due to bad IBM design, so we have to
31 * rely on the less exact irq13.
33 * Careful.. Not only is IRQ13 unreliable, but it is also
34 * leads to races. IBM designers who came up with it should
38 static irqreturn_t
math_error_irq(int cpl
, void *dev_id
)
41 if (ignore_fpu_irq
|| !boot_cpu_data
.hard_math
)
43 math_error((void __user
*)get_irq_regs()->ip
);
48 * New motherboards sometimes make IRQ 13 be a PCI interrupt,
49 * so allow interrupt sharing.
51 static struct irqaction fpu_irq
= {
52 .handler
= math_error_irq
,
56 void __init
init_ISA_irqs(void)
60 #ifdef CONFIG_X86_LOCAL_APIC
66 * 16 old-style INTA-cycle interrupts:
68 for (i
= 0; i
< NR_IRQS_LEGACY
; i
++) {
69 struct irq_desc
*desc
= irq_to_desc(i
);
71 desc
->status
= IRQ_DISABLED
;
75 set_irq_chip_and_handler_name(i
, &i8259A_chip
,
76 handle_level_irq
, "XT");
81 * IRQ2 is cascade interrupt to second interrupt controller
83 static struct irqaction irq2
= {
88 DEFINE_PER_CPU(vector_irq_t
, vector_irq
) = {
89 [0 ... IRQ0_VECTOR
- 1] = -1,
106 [IRQ15_VECTOR
+ 1 ... NR_VECTORS
- 1] = -1
109 int vector_used_by_percpu_irq(unsigned int vector
)
113 for_each_online_cpu(cpu
) {
114 if (per_cpu(vector_irq
, cpu
)[vector
] != -1)
121 static void __init
smp_intr_init(void)
123 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_SMP)
125 * The reschedule interrupt is a CPU-to-CPU reschedule-helper
126 * IPI, driven by wakeup.
128 alloc_intr_gate(RESCHEDULE_VECTOR
, reschedule_interrupt
);
130 /* IPIs for invalidation */
131 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+0, invalidate_interrupt0
);
132 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+1, invalidate_interrupt1
);
133 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+2, invalidate_interrupt2
);
134 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+3, invalidate_interrupt3
);
135 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+4, invalidate_interrupt4
);
136 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+5, invalidate_interrupt5
);
137 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+6, invalidate_interrupt6
);
138 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START
+7, invalidate_interrupt7
);
140 /* IPI for generic function call */
141 alloc_intr_gate(CALL_FUNCTION_VECTOR
, call_function_interrupt
);
143 /* IPI for single call function */
144 alloc_intr_gate(CALL_FUNCTION_SINGLE_VECTOR
,
145 call_function_single_interrupt
);
147 /* Low priority IPI to cleanup after moving an irq */
148 set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR
, irq_move_cleanup_interrupt
);
149 set_bit(IRQ_MOVE_CLEANUP_VECTOR
, used_vectors
);
153 static void __init
apic_intr_init(void)
157 #ifdef CONFIG_X86_LOCAL_APIC
158 /* self generated IPI for local APIC timer */
159 alloc_intr_gate(LOCAL_TIMER_VECTOR
, apic_timer_interrupt
);
161 /* generic IPI for platform specific use */
162 alloc_intr_gate(GENERIC_INTERRUPT_VECTOR
, generic_interrupt
);
164 /* IPI vectors for APIC spurious and error interrupts */
165 alloc_intr_gate(SPURIOUS_APIC_VECTOR
, spurious_interrupt
);
166 alloc_intr_gate(ERROR_APIC_VECTOR
, error_interrupt
);
167 # ifdef CONFIG_PERF_COUNTERS
168 alloc_intr_gate(LOCAL_PERF_VECTOR
, perf_counter_interrupt
);
169 alloc_intr_gate(LOCAL_PENDING_VECTOR
, perf_pending_interrupt
);
172 # ifdef CONFIG_X86_MCE_P4THERMAL
173 /* thermal monitor LVT interrupt */
174 alloc_intr_gate(THERMAL_APIC_VECTOR
, thermal_interrupt
);
179 /* Overridden in paravirt.c */
180 void init_IRQ(void) __attribute__((weak
, alias("native_init_IRQ")));
182 void __init
native_init_IRQ(void)
186 /* Execute any quirks before the call gates are initialised: */
187 x86_quirk_pre_intr_init();
192 * Cover the whole vector space, no vector can escape
193 * us. (some of these will be overridden and become
194 * 'special' SMP interrupts)
196 for (i
= 0; i
< (NR_VECTORS
- FIRST_EXTERNAL_VECTOR
); i
++) {
197 int vector
= FIRST_EXTERNAL_VECTOR
+ i
;
198 /* SYSCALL_VECTOR was reserved in trap_init. */
199 if (!test_bit(vector
, used_vectors
))
200 set_intr_gate(vector
, interrupt
[i
]);
207 * Call quirks after call gates are initialised (usually add in
208 * the architecture specific gates):
210 x86_quirk_intr_init();
213 * External FPU? Set up irq13 if so, for
214 * original braindamaged IBM FERR coupling.
216 if (boot_cpu_data
.hard_math
&& !cpu_has_fpu
)
217 setup_irq(FPU_IRQ
, &fpu_irq
);
219 irq_ctx_init(smp_processor_id());